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and Meter Installation Requirements Guide 08.10 NETWORK SINGLE-PHASE AND THREE-PHASE SERVICE SINGLE-PHASE SERVICE All single-phase underground single and multiple meter installations shall have 100 ampere, 3-wire service entrance equipment as a minimum for each meter location. Service size in excess of 400 amperes shall have transformer rated services. THREE-PHASE SERVICE All overhead polyphase single and multiple meter installations shall have 100 ampere, 4-wire, wye service entrance equipment as a minimum for each meter location. All polyphase underground single and multiple meter installations shall have 100 ampere, 4-wire, wye service entrance equipment as a minimum for each meter location. Services sizes in excess of 400 amperes shall have transformer rated services. End of Specification:
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